Device and method for measuring spatial shape of three-core fiber grating array based on low reflectivity

A technology of fiber grating array and three-core optical fiber, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of no real-time measurement and low measurement efficiency, and achieve low light source stability dependence, long service life, and high precision high effect

Inactive Publication Date: 2019-07-30
HARBIN INST OF TECH
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Problems solved by technology

However, this method can only be manually measured point by point, the measurement efficiency is low, and it does not have the ability of real-time measurement

Method used

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  • Device and method for measuring spatial shape of three-core fiber grating array based on low reflectivity
  • Device and method for measuring spatial shape of three-core fiber grating array based on low reflectivity
  • Device and method for measuring spatial shape of three-core fiber grating array based on low reflectivity

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Embodiment Construction

[0020] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings:

[0021] A low-reflectivity three-core fiber grating array spatial shape measurement device includes a broadband light source 11, a control computer 12, an EOM pulse modulator 13, an optical circulator 14, an optical frequency domain reflectometer OFDR15, and a multiplex optical switch 16. The broadband light source 11 and the EOM pulse modulator 13, the EOM pulse modulator 13 and the optical circulator 14, the optical circulator 14 and the multiplex optical switch 16, the multiplex optical switch 16 and the three-core fiber fanout 17 are connected by a single-mode fiber The optical circulator 14 and the optical frequency domain reflectometer OFDR15 are connected to form a passage through a single-mode optical fiber; the three-core optical fiber fanout 17 is connected to the low-reflectivity three-core fiber grating array sensor optical ...

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Abstract

The invention discloses a device and a method for measuring the shapes of spaces on the basis of low-reflectivity three-core fiber grating arrays, and belongs to technologies for manufacturing and measuring precision instruments. The device is structurally characterized in that a three-core fiber fan-out device is connected with an optical cable of a low-reflectivity three-core fiber Bragg grating array sensor, the optical cable of the low-reflectivity three-core fiber Bragg grating array sensor comprises a three-core fiber and a protective sleeve, fiber cores of the three-core fiber are uniformly configured, the protective sleeve is configured on the outside of the three-core fiber, and low-reflectivity fiber Bragg grating arrays are written on the three-core fiber. The method for measuring the shapes of the spaces includes measuring spectra by an optical frequency-domain reflectometer OFDR under the effects of a multi-way optical switch to acquire stress and temperature distribution of the low-reflectivity fiber Bragg grating arrays and optical cables of reference fiber Bragg grating arrays; decoupling influence of temperatures; reconstructing information of the shapes of the spaces. The optical cables of the reference fiber Bragg grating arrays are packaged in an outer stress isolation mode. The device and the method have the advantages that the device and the method are high in signal-to-noise ratio and precision and are insensible to environments, and the device can be attached onto the surfaces of measured components to measure the measured components in real time and is long in service life.

Description

Technical field [0001] The invention belongs to precision instrument manufacturing and measurement technology, and particularly relates to a spatial shape measurement device and method based on a low reflectivity three-core fiber grating array. Background technique [0002] With the continuous development of the aerospace industry, automobile industry, electronics industry, and cutting-edge industries, the demand for spatial shape measurement (three-dimensional surface shape measurement of complex curved surfaces, complex deformation of smart materials, etc.) has increased dramatically. Due to the limitation of measurement time and sampling point density, spatial shape measurement becomes very difficult, especially the changeable and harsh measurement environment makes the traditional spatial shape measurement method unable to meet the demand. In the past spatial shape measurement, many methods were used such as template measurement, structured light three-dimensional vision meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
Inventor 崔继文冯昆鹏谭久彬
Owner HARBIN INST OF TECH
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